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  #1  
Old 09-21-2008, 10:03 PM
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code p1668 help

I am working on a 96 that is throwing the p1668 code it says pcm-idm communication. I have tested the pcm and the idm on different trucks and they are fine. What other components can I check?
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  #2  
Old 09-23-2008, 05:08 PM
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Re: code p1668 help

DTC P1668 and P1670 indicates that a communication error has occurred between the PCM and the IDM.
Possible causes:
Open fuse
IDM relay
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM powering circuits
PCM
Check for other codes
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Old 09-24-2008, 12:18 AM
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Re: code p1668 help

no other codes. I changed around the relays and the truck srarted, but now it has a short in it. The wait to start light flashes constantly and the lights in the dash flash. It's almost like you are turning the key on and off really fast.
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Old 09-24-2008, 12:43 AM
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Re: code p1668 help

Just for drill disconnect the fuel heater. They like to fail and short on out the PCM circuit but I have not read of anyone having this exact set of problems. I would also be checking out those relays.

Tom
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Old 09-25-2008, 12:46 AM
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Re: code p1668 help

I will try new relays tomorrow
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Old 09-27-2008, 02:26 AM
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Re: code p1668 help

It was the relay.
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